A spokesperson at the Met Office said: “Stay out of the sun. Keep your home as cool as possible – shading windows and shutting them during the day may help.

“Open them when it is cooler at night. Keep drinking fluids. If there’s anybody you know, for example an older person living on their own, who might be at special risk, make sure they know what to do”.

Merseyside is not expected to suffer from the worst of the heat as cloudy conditions will cool down the weather, although it will still be hot across the region.

Much of the UK will be hot this week – the highest temperatures will be across southeastern areas, with lower temperatures in the northwest #heatwavepic.twitter.com/CUANOTp3RG

Most of the week will see temperatures into the high 20’s and in any sunshine it could get even hotter.

Matthew Lewis, Deputy Chief Meteorologist at the Met Office, said: “The heatwave conditions will continue much of England through this week, with temperatures possibly into the mid 30s Celsius in places on Thursday and Friday.

“More changeable conditions are expected across Northern Ireland and western Scotland with showers or longer spells of rain at times with maximum temperatures nearer normal.”

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